Check out my rankings within each division by clicking on the links below.
Note: Results through Sept. 18.
MIDDLEWEIGHT DIVISION (UP TO 185 POUNDS)
1. Michael Bisping (30-7)
The UFC champion recorded his first defense in October, but it was a more difficult fight than many expected going in. Dan Henderson gave Bisping all he could handle in a five-round fight. Contenders are licking their chops at the thought of taking Bisping's belt. He has a rather large target on his back.
Next: UFC 217 on Nov. 4, vs. Georges St-Pierre
2. Robert Whittaker (19-4)
In a span of three months, Whittaker knocked out Ronaldo "Jacare" Souza and edged Yoel Romero in a five-round battle. That's about as impressive as it gets. Next up: A UFC title fight against Michael Bisping.
3. Luke Rockhold (16-3)
After missing an entire year to knee injury and lack of opponent options, Rockhold returned to the win column with a finish over David Branch in September. The middleweight division has been something of a mess since Rockhold forfeited the UFC title Michael Bisping in 2016. He's eager to restore order.
4. Yoel Romero (12-2)
Romero came close to capturing the UFC's interim title, but couldn't outlast Robert Whittaker at UFC 213. He certainly has (plenty) bounce back potential, but time is also of an essence. He's on the plus side of 40.
5. Gegard Mousasi (41-6-2)
Mousasi finished out his UFC contract on a disappointing note. While he defeated Chris Weidman at UFC 210 in April, the finish came under a storm of controversy thanks to a referee error. Nevertheless, it goes down as a TKO win.
Next: Bellator 185 on Oct. 20, vs. Alexander Shlemenko
6. Chris Weidman (14-3)
It will take a few more wins for Weidman to stand atop the middleweight division again, but at least for one night, it kind of felt that way again. Weidman was superb in a submission win over Kelvin Gastelum in July, in his native Long Island. Next: TBD
7. Jacare Souza (24-5)
Souza probably should have been granted a UFC title shot a long time ago, but that's not about to change following his shocking knockout loss to Whittaker. It goes without saying: Souza has plenty of bounce-back potential, but this loss is a big one.
8. Derek Brunson (17-5)
Brunson snapped a two-fight skid in highlight-reel fashion in June, knocking out Daniel Kelly inside the first round. He probably should have beat Anderson Silva in the fight before that too, but judges saw it different. Get this man a big fight.
Next: UFC Fight Night on Oct. 28, vs. Lyoto Machida
9. Lyoto Machida (21-6)
The former light heavyweight champion made an immediate splash at 185 pounds in 2013, but he has dropped three of four. He's also been finished in his past two and is now under suspension for an anti-doping violation. Not a good stretch.
Next: UFC Fight Night on Oct. 28, vs. Derek Brunson
10. David Branch (21-4)
One loss to Luke Rockhold in September doesn't erase a five-year unbeaten run for Branch -- but this was a big shot for him to catapult himself up the rankings. He'll look to start a new streak in his next fight.